Smaller Stokes Shift Induced Highly Efficient Broadband Near Infrared Garnet Phosphor,Laser & Photonics Reviews

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Smaller Stokes Shift Induced Highly Efficient Broadband Near Infrared Garnet Phosphor
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2022-12-13 , DOI: 10.1002/lpor.202200586
Jingnan Zhang _{1,

2} , Liangliang Zhang ₁ , Feng Liu ₃ , Hao Wu ₁ , Huajun Wu ₁ , Guohui Pan ₁ , Yongshi Luo ₁ , Zhendong Hao ₁ , Jiahua Zhang _{1,

2}

Affiliation

Broadband near-infrared (NIR) phosphor converted light emitting diodes (pc-LEDs) are novel compact light sources that enable portable devices for substance detection. However, to achieve such efficient pc-LEDs is still a challenge due to lack of efficient phosphors. In this paper, Stokes shift as an efficiency predictor is emphasized. In Cr³⁺ activated Ca₂LuZr₂Al₃O₁₂ (CLZA) garnet phosphor, Stokes shift decreases from 2990 to 2854 cm⁻¹ upon substituting Ca-Zr with Lu-Al. As a result, electron–phonon coupling related nonradiative process is reduced. The external quantum efficiency is significantly enhanced to 47.4%, and the as fabricated NIR pc-LED offers 33.7% @10 mA electro-optical efficiency. The results can advance the development of efficient NIR phosphors.

中文翻译：

较小的斯托克斯位移诱导高效宽带近红外石榴石荧光粉

宽带近红外 (NIR) 磷光体转换发光二极管 (pc-LED) 是新型紧凑型光源，可用于便携式设备进行物质检测。然而，由于缺乏高效的荧光粉，实现如此高效的 pc-LED 仍然是一个挑战。在本文中，强调了 Stokes 位移作为效率预测因子。在 Cr ³⁺激活的 Ca ₂ LuZr ₂ Al ₃ O ₁₂ (CLZA) 石榴石荧光粉中，斯托克斯位移从 2990 降低到 2854 cm ^-1用 Lu-Al 代替 Ca-Zr。结果，电子 - 声子耦合相关的非辐射过程减少了。外部量子效率显着提高到 47.4%，并且制造的 NIR pc-LED 提供 33.7% @10 mA 电光效率。结果可以推动高效近红外荧光粉的开发。

更新日期：2022-12-13

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